drivers/video/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/sched.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/major.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/mman.h>
  26 #include <linux/tty.h>
  27 #include <linux/init.h>
  28 #include <linux/linux_logo.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/console.h>
  31 #ifdef CONFIG_KMOD
  32 #include <linux/kmod.h>
  33 #endif
  34 #include <linux/devfs_fs_kernel.h>
  35 #include <linux/err.h>
  36 #include <linux/kernel.h>
  37 #include <linux/device.h>
  38 #include <linux/efi.h>
  39
  40 #if defined(__mc68000__) || defined(CONFIG_APUS)
  41 #include <asm/setup.h>
  42 #endif
  43
  44 #include <asm/io.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/page.h>
  47 #include <asm/pgtable.h>
  48
  49 #include <linux/fb.h>
  50
  51     /*
  52      *  Frame buffer device initialization and setup routines
  53      */
  54
  55 #define FBPIXMAPSIZE    (1024 * 8)
  56
  57 static struct notifier_block *fb_notifier_list;
  58 struct fb_info *registered_fb[FB_MAX];
  59 int num_registered_fb;
  60
  61 /*
  62  * Helpers
  63  */
  64
  65 int fb_get_color_depth(struct fb_var_screeninfo *var)
  66 {
  67         if (var->green.length == var->blue.length &&
  68             var->green.length == var->red.length &&
  69             !var->green.offset && !var->blue.offset &&
  70             !var->red.offset)
  71                 return var->green.length;
  72         else
  73                 return (var->green.length + var->red.length +
  74                         var->blue.length);
  75 }
  76 EXPORT_SYMBOL(fb_get_color_depth);
  77
  78 /*
  79  * Data padding functions.
  80  */
  81 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
  82 {
  83         int i;
  84
  85         for (i = height; i--; ) {
  86                 memcpy(dst, src, s_pitch);
  87                 src += s_pitch;
  88                 dst += d_pitch;
  89         }
  90 }
  91 EXPORT_SYMBOL(fb_pad_aligned_buffer);
  92
  93 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
  94                                 u32 shift_high, u32 shift_low, u32 mod)
  95 {
  96         u8 mask = (u8) (0xfff << shift_high), tmp;
  97         int i, j;
  98
  99         for (i = height; i--; ) {
 100                 for (j = 0; j < idx; j++) {
 101                         tmp = dst[j];
 102                         tmp &= mask;
 103                         tmp |= *src >> shift_low;
 104                         dst[j] = tmp;
 105                         tmp = *src << shift_high;
 106                         dst[j+1] = tmp;
 107                         src++;
 108                 }
 109                 tmp = dst[idx];
 110                 tmp &= mask;
 111                 tmp |= *src >> shift_low;
 112                 dst[idx] = tmp;
 113                 if (shift_high < mod) {
 114                         tmp = *src << shift_high;
 115                         dst[idx+1] = tmp;
 116                 }
 117                 src++;
 118                 dst += d_pitch;
 119         }
 120 }
 121 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 122
 123 /*
 124  * we need to lock this section since fb_cursor
 125  * may use fb_imageblit()
 126  */
 127 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 128 {
 129         u32 align = buf->buf_align - 1, offset;
 130         char *addr = buf->addr;
 131
 132         /* If IO mapped, we need to sync before access, no sharing of
 133          * the pixmap is done
 134          */
 135         if (buf->flags & FB_PIXMAP_IO) {
 136                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 137                         info->fbops->fb_sync(info);
 138                 return addr;
 139         }
 140
 141         /* See if we fit in the remaining pixmap space */
 142         offset = buf->offset + align;
 143         offset &= ~align;
 144         if (offset + size > buf->size) {
 145                 /* We do not fit. In order to be able to re-use the buffer,
 146                  * we must ensure no asynchronous DMA'ing or whatever operation
 147                  * is in progress, we sync for that.
 148                  */
 149                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 150                         info->fbops->fb_sync(info);
 151                 offset = 0;
 152         }
 153         buf->offset = offset + size;
 154         addr += offset;
 155
 156         return addr;
 157 }
 158
 159 #ifdef CONFIG_LOGO
 160 #include <linux/linux_logo.h>
 161
 162 static inline unsigned safe_shift(unsigned d, int n)
 163 {
 164         return n < 0 ? d >> -n : d << n;
 165 }
 166
 167 static void fb_set_logocmap(struct fb_info *info,
 168                                    const struct linux_logo *logo)
 169 {
 170         struct fb_cmap palette_cmap;
 171         u16 palette_green[16];
 172         u16 palette_blue[16];
 173         u16 palette_red[16];
 174         int i, j, n;
 175         const unsigned char *clut = logo->clut;
 176
 177         palette_cmap.start = 0;
 178         palette_cmap.len = 16;
 179         palette_cmap.red = palette_red;
 180         palette_cmap.green = palette_green;
 181         palette_cmap.blue = palette_blue;
 182         palette_cmap.transp = NULL;
 183
 184         for (i = 0; i < logo->clutsize; i += n) {
 185                 n = logo->clutsize - i;
 186                 /* palette_cmap provides space for only 16 colors at once */
 187                 if (n > 16)
 188                         n = 16;
 189                 palette_cmap.start = 32 + i;
 190                 palette_cmap.len = n;
 191                 for (j = 0; j < n; ++j) {
 192                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 193                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 194                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 195                         clut += 3;
 196                 }
 197                 fb_set_cmap(&palette_cmap, info);
 198         }
 199 }
 200
 201 static void  fb_set_logo_truepalette(struct fb_info *info,
 202                                             const struct linux_logo *logo,
 203                                             u32 *palette)
 204 {
 205         unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 206         unsigned char redmask, greenmask, bluemask;
 207         int redshift, greenshift, blueshift;
 208         int i;
 209         const unsigned char *clut = logo->clut;
 210
 211         /*
 212          * We have to create a temporary palette since console palette is only
 213          * 16 colors long.
 214          */
 215         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 216         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 217         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 218         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 219         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 220         greenshift = info->var.green.offset - (8 - info->var.green.length);
 221         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 222
 223         for ( i = 0; i < logo->clutsize; i++) {
 224                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 225                                  safe_shift((clut[1] & greenmask), greenshift) |
 226                                  safe_shift((clut[2] & bluemask), blueshift));
 227                 clut += 3;
 228         }
 229 }
 230
 231 static void fb_set_logo_directpalette(struct fb_info *info,
 232                                              const struct linux_logo *logo,
 233                                              u32 *palette)
 234 {
 235         int redshift, greenshift, blueshift;
 236         int i;
 237
 238         redshift = info->var.red.offset;
 239         greenshift = info->var.green.offset;
 240         blueshift = info->var.blue.offset;
 241
 242         for (i = 32; i < logo->clutsize; i++)
 243                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 244 }
 245
 246 static void fb_set_logo(struct fb_info *info,
 247                                const struct linux_logo *logo, u8 *dst,
 248                                int depth)
 249 {
 250         int i, j, k, fg = 1;
 251         const u8 *src = logo->data;
 252         u8 d, xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 253
 254         if (fb_get_color_depth(&info->var) == 3)
 255                 fg = 7;
 256
 257         switch (depth) {
 258         case 4:
 259                 for (i = 0; i < logo->height; i++)
 260                         for (j = 0; j < logo->width; src++) {
 261                                 *dst++ = *src >> 4;
 262                                 j++;
 263                                 if (j < logo->width) {
 264                                         *dst++ = *src & 0x0f;
 265                                         j++;
 266                                 }
 267                         }
 268                 break;
 269         case 1:
 270                 for (i = 0; i < logo->height; i++) {
 271                         for (j = 0; j < logo->width; src++) {
 272                                 d = *src ^ xor;
 273                                 for (k = 7; k >= 0; k--) {
 274                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 275                                         j++;
 276                                 }
 277                         }
 278                 }
 279                 break;
 280         }
 281 }
 282
 283 /*
 284  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 285  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 286  * the visual format and color depth of the framebuffer, the DAC, the
 287  * pseudo_palette, and the logo data will be adjusted accordingly.
 288  *
 289  * Case 1 - linux_logo_clut224:
 290  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 291  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 292  *
 293  * For visuals that require color info from the pseudo_palette, we also construct
 294  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 295  * will be set.
 296  *
 297  * Case 2 - linux_logo_vga16:
 298  * The number of colors just matches the console colors, thus there is no need
 299  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 300  * each byte contains color information for two pixels (upper and lower nibble).
 301  * To be consistent with fb_imageblit() usage, we therefore separate the two
 302  * nibbles into separate bytes. The "depth" flag will be set to 4.
 303  *
 304  * Case 3 - linux_logo_mono:
 305  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 306  * We isolate each bit and expand each into a byte. The "depth" flag will
 307  * be set to 1.
 308  */
 309 static struct logo_data {
 310         int depth;
 311         int needs_directpalette;
 312         int needs_truepalette;
 313         int needs_cmapreset;
 314         const struct linux_logo *logo;
 315 } fb_logo;
 316
 317 int fb_prepare_logo(struct fb_info *info)
 318 {
 319         int depth = fb_get_color_depth(&info->var);
 320
 321         memset(&fb_logo, 0, sizeof(struct logo_data));
 322
 323         if (info->flags & FBINFO_MISC_TILEBLITTING)
 324                 return 0;
 325
 326         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 327                 depth = info->var.blue.length;
 328                 if (info->var.red.length < depth)
 329                         depth = info->var.red.length;
 330                 if (info->var.green.length < depth)
 331                         depth = info->var.green.length;
 332         }
 333
 334         if (depth >= 8) {
 335                 switch (info->fix.visual) {
 336                 case FB_VISUAL_TRUECOLOR:
 337                         fb_logo.needs_truepalette = 1;
 338                         break;
 339                 case FB_VISUAL_DIRECTCOLOR:
 340                         fb_logo.needs_directpalette = 1;
 341                         fb_logo.needs_cmapreset = 1;
 342                         break;
 343                 case FB_VISUAL_PSEUDOCOLOR:
 344                         fb_logo.needs_cmapreset = 1;
 345                         break;
 346                 }
 347         }
 348
 349         /* Return if no suitable logo was found */
 350         fb_logo.logo = fb_find_logo(depth);
 351
 352         if (!fb_logo.logo || fb_logo.logo->height > info->var.yres) {
 353                 fb_logo.logo = NULL;
 354                 return 0;
 355         }
 356         /* What depth we asked for might be different from what we get */
 357         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 358                 fb_logo.depth = 8;
 359         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 360                 fb_logo.depth = 4;
 361         else
 362                 fb_logo.depth = 1;
 363         return fb_logo.logo->height;
 364 }
 365
 366 int fb_show_logo(struct fb_info *info)
 367 {
 368         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 369         unsigned char *logo_new = NULL;
 370         struct fb_image image;
 371         int x;
 372
 373         /* Return if the frame buffer is not mapped or suspended */
 374         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
 375                 return 0;
 376
 377         image.depth = 8;
 378         image.data = fb_logo.logo->data;
 379
 380         if (fb_logo.needs_cmapreset)
 381                 fb_set_logocmap(info, fb_logo.logo);
 382
 383         if (fb_logo.needs_truepalette ||
 384             fb_logo.needs_directpalette) {
 385                 palette = kmalloc(256 * 4, GFP_KERNEL);
 386                 if (palette == NULL)
 387                         return 0;
 388
 389                 if (fb_logo.needs_truepalette)
 390                         fb_set_logo_truepalette(info, fb_logo.logo, palette);
 391                 else
 392                         fb_set_logo_directpalette(info, fb_logo.logo, palette);
 393
 394                 saved_pseudo_palette = info->pseudo_palette;
 395                 info->pseudo_palette = palette;
 396         }
 397
 398         if (fb_logo.depth <= 4) {
 399                 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height,
 400                                    GFP_KERNEL);
 401                 if (logo_new == NULL) {
 402                         kfree(palette);
 403                         if (saved_pseudo_palette)
 404                                 info->pseudo_palette = saved_pseudo_palette;
 405                         return 0;
 406                 }
 407                 image.data = logo_new;
 408                 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth);
 409         }
 410
 411         image.width = fb_logo.logo->width;
 412         image.height = fb_logo.logo->height;
 413         image.dy = 0;
 414
 415         for (x = 0; x < num_online_cpus() * (fb_logo.logo->width + 8) &&
 416              x <= info->var.xres-fb_logo.logo->width; x += (fb_logo.logo->width + 8)) {
 417                 image.dx = x;
 418                 info->fbops->fb_imageblit(info, &image);
 419         }
 420
 421         kfree(palette);
 422         if (saved_pseudo_palette != NULL)
 423                 info->pseudo_palette = saved_pseudo_palette;
 424         kfree(logo_new);
 425         return fb_logo.logo->height;
 426 }
 427 #else
 428 int fb_prepare_logo(struct fb_info *info) { return 0; }
 429 int fb_show_logo(struct fb_info *info) { return 0; }
 430 #endif /* CONFIG_LOGO */
 431
 432 static int fbmem_read_proc(char *buf, char **start, off_t offset,
 433                            int len, int *eof, void *private)
 434 {
 435         struct fb_info **fi;
 436         int clen;
 437
 438         clen = 0;
 439         for (fi = registered_fb; fi < &registered_fb[FB_MAX] && len < 4000; fi++)
 440                 if (*fi)
 441                         clen += sprintf(buf + clen, "%d %s\n",
 442                                         (*fi)->node,
 443                                         (*fi)->fix.id);
 444         *start = buf + offset;
 445         if (clen > offset)
 446                 clen -= offset;
 447         else
 448                 clen = 0;
 449         return clen < len ? clen : len;
 450 }
 451
 452 static ssize_t
 453 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 454 {
 455         unsigned long p = *ppos;
 456         struct inode *inode = file->f_dentry->d_inode;
 457         int fbidx = iminor(inode);
 458         struct fb_info *info = registered_fb[fbidx];
 459         u32 *buffer, *dst;
 460         u32 __iomem *src;
 461         int c, i, cnt = 0, err = 0;
 462         unsigned long total_size;
 463
 464         if (!info || ! info->screen_base)
 465                 return -ENODEV;
 466
 467         if (info->state != FBINFO_STATE_RUNNING)
 468                 return -EPERM;
 469
 470         if (info->fbops->fb_read)
 471                 return info->fbops->fb_read(file, buf, count, ppos);
 472
 473         total_size = info->screen_size;
 474         if (total_size == 0)
 475                 total_size = info->fix.smem_len;
 476
 477         if (p >= total_size)
 478             return 0;
 479         if (count >= total_size)
 480             count = total_size;
 481         if (count + p > total_size)
 482                 count = total_size - p;
 483
 484         cnt = 0;
 485         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 486                          GFP_KERNEL);
 487         if (!buffer)
 488                 return -ENOMEM;
 489
 490         src = (u32 __iomem *) (info->screen_base + p);
 491
 492         if (info->fbops->fb_sync)
 493                 info->fbops->fb_sync(info);
 494
 495         while (count) {
 496                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 497                 dst = buffer;
 498                 for (i = c >> 2; i--; )
 499                         *dst++ = fb_readl(src++);
 500                 if (c & 3) {
 501                         u8 *dst8 = (u8 *) dst;
 502                         u8 __iomem *src8 = (u8 __iomem *) src;
 503
 504                         for (i = c & 3; i--;)
 505                                 *dst8++ = fb_readb(src8++);
 506
 507                         src = (u32 __iomem *) src8;
 508                 }
 509
 510                 if (copy_to_user(buf, buffer, c)) {
 511                         err = -EFAULT;
 512                         break;
 513                 }
 514                 *ppos += c;
 515                 buf += c;
 516                 cnt += c;
 517                 count -= c;
 518         }
 519
 520         kfree(buffer);
 521         return (err) ? err : cnt;
 522 }
 523
 524 static ssize_t
 525 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 526 {
 527         unsigned long p = *ppos;
 528         struct inode *inode = file->f_dentry->d_inode;
 529         int fbidx = iminor(inode);
 530         struct fb_info *info = registered_fb[fbidx];
 531         u32 *buffer, *src;
 532         u32 __iomem *dst;
 533         int c, i, cnt = 0, err;
 534         unsigned long total_size;
 535
 536         if (!info || !info->screen_base)
 537                 return -ENODEV;
 538
 539         if (info->state != FBINFO_STATE_RUNNING)
 540                 return -EPERM;
 541
 542         if (info->fbops->fb_write)
 543                 return info->fbops->fb_write(file, buf, count, ppos);
 544
 545         total_size = info->screen_size;
 546         if (total_size == 0)
 547                 total_size = info->fix.smem_len;
 548
 549         if (p > total_size)
 550             return -ENOSPC;
 551         if (count >= total_size)
 552             count = total_size;
 553         err = 0;
 554         if (count + p > total_size) {
 555             count = total_size - p;
 556             err = -ENOSPC;
 557         }
 558         cnt = 0;
 559         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 560                          GFP_KERNEL);
 561         if (!buffer)
 562                 return -ENOMEM;
 563
 564         dst = (u32 __iomem *) (info->screen_base + p);
 565
 566         if (info->fbops->fb_sync)
 567                 info->fbops->fb_sync(info);
 568
 569         while (count) {
 570                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 571                 src = buffer;
 572                 if (copy_from_user(src, buf, c)) {
 573                         err = -EFAULT;
 574                         break;
 575                 }
 576                 for (i = c >> 2; i--; )
 577                         fb_writel(*src++, dst++);
 578                 if (c & 3) {
 579                         u8 *src8 = (u8 *) src;
 580                         u8 __iomem *dst8 = (u8 __iomem *) dst;
 581
 582                         for (i = c & 3; i--; )
 583                                 fb_writeb(*src8++, dst8++);
 584
 585                         dst = (u32 __iomem *) dst8;
 586                 }
 587                 *ppos += c;
 588                 buf += c;
 589                 cnt += c;
 590                 count -= c;
 591         }
 592         kfree(buffer);
 593
 594         return (err) ? err : cnt;
 595 }
 596
 597 #ifdef CONFIG_KMOD
 598 static void try_to_load(int fb)
 599 {
 600         request_module("fb%d", fb);
 601 }
 602 #endif /* CONFIG_KMOD */
 603
 604 int
 605 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 606 {
 607         int xoffset = var->xoffset;
 608         int yoffset = var->yoffset;
 609         int err;
 610
 611         if (xoffset < 0 || yoffset < 0 || !info->fbops->fb_pan_display ||
 612             xoffset + info->var.xres > info->var.xres_virtual ||
 613             yoffset + info->var.yres > info->var.yres_virtual)
 614                 return -EINVAL;
 615         if ((err = info->fbops->fb_pan_display(var, info)))
 616                 return err;
 617         info->var.xoffset = var->xoffset;
 618         info->var.yoffset = var->yoffset;
 619         if (var->vmode & FB_VMODE_YWRAP)
 620                 info->var.vmode |= FB_VMODE_YWRAP;
 621         else
 622                 info->var.vmode &= ~FB_VMODE_YWRAP;
 623         return 0;
 624 }
 625
 626 int
 627 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 628 {
 629         int err;
 630
 631         if (var->activate & FB_ACTIVATE_INV_MODE) {
 632                 struct fb_videomode mode1, mode2;
 633                 int ret = 0;
 634
 635                 fb_var_to_videomode(&mode1, var);
 636                 fb_var_to_videomode(&mode2, &info->var);
 637                 /* make sure we don't delete the videomode of current var */
 638                 ret = fb_mode_is_equal(&mode1, &mode2);
 639
 640                 if (!ret) {
 641                     struct fb_event event;
 642
 643                     event.info = info;
 644                     event.data = &mode1;
 645                     ret = notifier_call_chain(&fb_notifier_list,
 646                                               FB_EVENT_MODE_DELETE, &event);
 647                 }
 648
 649                 if (!ret)
 650                     fb_delete_videomode(&mode1, &info->modelist);
 651
 652                 return ret;
 653         }
 654
 655         if ((var->activate & FB_ACTIVATE_FORCE) ||
 656             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 657                 if (!info->fbops->fb_check_var) {
 658                         *var = info->var;
 659                         return 0;
 660                 }
 661
 662                 if ((err = info->fbops->fb_check_var(var, info)))
 663                         return err;
 664
 665                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
 666                         struct fb_videomode mode;
 667                         int err = 0;
 668
 669                         info->var = *var;
 670                         if (info->fbops->fb_set_par)
 671                                 info->fbops->fb_set_par(info);
 672
 673                         fb_pan_display(info, &info->var);
 674
 675                         fb_set_cmap(&info->cmap, info);
 676
 677                         fb_var_to_videomode(&mode, &info->var);
 678
 679                         if (info->modelist.prev && info->modelist.next &&
 680                             !list_empty(&info->modelist))
 681                                 err = fb_add_videomode(&mode, &info->modelist);
 682
 683                         if (!err && info->flags & FBINFO_MISC_USEREVENT) {
 684                                 struct fb_event event;
 685
 686                                 info->flags &= ~FBINFO_MISC_USEREVENT;
 687                                 event.info = info;
 688                                 notifier_call_chain(&fb_notifier_list,
 689                                                     FB_EVENT_MODE_CHANGE,
 690                                                     &event);
 691                         }
 692                 }
 693         }
 694         return 0;
 695 }
 696
 697 int
 698 fb_blank(struct fb_info *info, int blank)
 699 {
 700         int ret = -EINVAL;
 701
 702         if (blank > FB_BLANK_POWERDOWN)
 703                 blank = FB_BLANK_POWERDOWN;
 704
 705         if (info->fbops->fb_blank)
 706                 ret = info->fbops->fb_blank(blank, info);
 707
 708         if (!ret) {
 709                 struct fb_event event;
 710
 711                 event.info = info;
 712                 event.data = &blank;
 713                 notifier_call_chain(&fb_notifier_list, FB_EVENT_BLANK, &event);
 714         }
 715
 716         return ret;
 717 }
 718
 719 static int
 720 fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 721          unsigned long arg)
 722 {
 723         int fbidx = iminor(inode);
 724         struct fb_info *info = registered_fb[fbidx];
 725         struct fb_ops *fb = info->fbops;
 726         struct fb_var_screeninfo var;
 727         struct fb_fix_screeninfo fix;
 728         struct fb_con2fbmap con2fb;
 729         struct fb_cmap_user cmap;
 730         struct fb_event event;
 731         void __user *argp = (void __user *)arg;
 732         int i;
 733
 734         if (!fb)
 735                 return -ENODEV;
 736         switch (cmd) {
 737         case FBIOGET_VSCREENINFO:
 738                 return copy_to_user(argp, &info->var,
 739                                     sizeof(var)) ? -EFAULT : 0;
 740         case FBIOPUT_VSCREENINFO:
 741                 if (copy_from_user(&var, argp, sizeof(var)))
 742                         return -EFAULT;
 743                 acquire_console_sem();
 744                 info->flags |= FBINFO_MISC_USEREVENT;
 745                 i = fb_set_var(info, &var);
 746                 info->flags &= ~FBINFO_MISC_USEREVENT;
 747                 release_console_sem();
 748                 if (i) return i;
 749                 if (copy_to_user(argp, &var, sizeof(var)))
 750                         return -EFAULT;
 751                 return 0;
 752         case FBIOGET_FSCREENINFO:
 753                 return copy_to_user(argp, &info->fix,
 754                                     sizeof(fix)) ? -EFAULT : 0;
 755         case FBIOPUTCMAP:
 756                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 757                         return -EFAULT;
 758                 return (fb_set_user_cmap(&cmap, info));
 759         case FBIOGETCMAP:
 760                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
 761                         return -EFAULT;
 762                 return fb_cmap_to_user(&info->cmap, &cmap);
 763         case FBIOPAN_DISPLAY:
 764                 if (copy_from_user(&var, argp, sizeof(var)))
 765                         return -EFAULT;
 766                 acquire_console_sem();
 767                 i = fb_pan_display(info, &var);
 768                 release_console_sem();
 769                 if (i)
 770                         return i;
 771                 if (copy_to_user(argp, &var, sizeof(var)))
 772                         return -EFAULT;
 773                 return 0;
 774         case FBIO_CURSOR:
 775                 return -EINVAL;
 776         case FBIOGET_CON2FBMAP:
 777                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 778                         return -EFAULT;
 779                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
 780                     return -EINVAL;
 781                 con2fb.framebuffer = -1;
 782                 event.info = info;
 783                 event.data = &con2fb;
 784                 notifier_call_chain(&fb_notifier_list,
 785                                     FB_EVENT_GET_CONSOLE_MAP, &event);
 786                 return copy_to_user(argp, &con2fb,
 787                                     sizeof(con2fb)) ? -EFAULT : 0;
 788         case FBIOPUT_CON2FBMAP:
 789                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
 790                         return - EFAULT;
 791                 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
 792                     return -EINVAL;
 793                 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
 794                     return -EINVAL;
 795 #ifdef CONFIG_KMOD
 796                 if (!registered_fb[con2fb.framebuffer])
 797                     try_to_load(con2fb.framebuffer);
 798 #endif /* CONFIG_KMOD */
 799                 if (!registered_fb[con2fb.framebuffer])
 800                     return -EINVAL;
 801                 event.info = info;
 802                 event.data = &con2fb;
 803                 return notifier_call_chain(&fb_notifier_list,
 804                                            FB_EVENT_SET_CONSOLE_MAP,
 805                                            &event);
 806         case FBIOBLANK:
 807                 acquire_console_sem();
 808                 info->flags |= FBINFO_MISC_USEREVENT;
 809                 i = fb_blank(info, arg);
 810                 info->flags &= ~FBINFO_MISC_USEREVENT;
 811                 release_console_sem();
 812                 return i;
 813         default:
 814                 if (fb->fb_ioctl == NULL)
 815                         return -EINVAL;
 816                 return fb->fb_ioctl(inode, file, cmd, arg, info);
 817         }
 818 }
 819
 820 #ifdef CONFIG_COMPAT
 821 static long
 822 fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 823 {
 824         int fbidx = iminor(file->f_dentry->d_inode);
 825         struct fb_info *info = registered_fb[fbidx];
 826         struct fb_ops *fb = info->fbops;
 827         long ret;
 828
 829         if (fb->fb_compat_ioctl == NULL)
 830                 return -ENOIOCTLCMD;
 831         lock_kernel();
 832         ret = fb->fb_compat_ioctl(file, cmd, arg, info);
 833         unlock_kernel();
 834         return ret;
 835 }
 836 #endif
 837
 838 static int
 839 fb_mmap(struct file *file, struct vm_area_struct * vma)
 840 {
 841         int fbidx = iminor(file->f_dentry->d_inode);
 842         struct fb_info *info = registered_fb[fbidx];
 843         struct fb_ops *fb = info->fbops;
 844         unsigned long off;
 845 #if !defined(__sparc__) || defined(__sparc_v9__)
 846         unsigned long start;
 847         u32 len;
 848 #endif
 849
 850         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 851                 return -EINVAL;
 852         off = vma->vm_pgoff << PAGE_SHIFT;
 853         if (!fb)
 854                 return -ENODEV;
 855         if (fb->fb_mmap) {
 856                 int res;
 857                 lock_kernel();
 858                 res = fb->fb_mmap(info, file, vma);
 859                 unlock_kernel();
 860                 return res;
 861         }
 862
 863 #if defined(__sparc__) && !defined(__sparc_v9__)
 864         /* Should never get here, all fb drivers should have their own
 865            mmap routines */
 866         return -EINVAL;
 867 #else
 868         /* !sparc32... */
 869         lock_kernel();
 870
 871         /* frame buffer memory */
 872         start = info->fix.smem_start;
 873         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
 874         if (off >= len) {
 875                 /* memory mapped io */
 876                 off -= len;
 877                 if (info->var.accel_flags) {
 878                         unlock_kernel();
 879                         return -EINVAL;
 880                 }
 881                 start = info->fix.mmio_start;
 882                 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
 883         }
 884         unlock_kernel();
 885         start &= PAGE_MASK;
 886         if ((vma->vm_end - vma->vm_start + off) > len)
 887                 return -EINVAL;
 888         off += start;
 889         vma->vm_pgoff = off >> PAGE_SHIFT;
 890         /* This is an IO map - tell maydump to skip this VMA */
 891         vma->vm_flags |= VM_IO | VM_RESERVED;
 892 #if defined(__sparc_v9__)
 893         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 894                                 vma->vm_end - vma->vm_start, vma->vm_page_prot))
 895                 return -EAGAIN;
 896 #else
 897 #if defined(__mc68000__)
 898 #if defined(CONFIG_SUN3)
 899         pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
 900 #elif defined(CONFIG_MMU)
 901         if (CPU_IS_020_OR_030)
 902                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
 903         if (CPU_IS_040_OR_060) {
 904                 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
 905                 /* Use no-cache mode, serialized */
 906                 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
 907         }
 908 #endif
 909 #elif defined(__powerpc__)
 910         vma->vm_page_prot = phys_mem_access_prot(file, off,
 911                                                  vma->vm_end - vma->vm_start,
 912                                                  vma->vm_page_prot);
 913 #elif defined(__alpha__)
 914         /* Caching is off in the I/O space quadrant by design.  */
 915 #elif defined(__i386__) || defined(__x86_64__)
 916         if (boot_cpu_data.x86 > 3)
 917                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 918 #elif defined(__mips__)
 919         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 920 #elif defined(__hppa__)
 921         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 922 #elif defined(__arm__) || defined(__sh__) || defined(__m32r__)
 923         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 924 #elif defined(__ia64__)
 925         if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
 926                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 927         else
 928                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 929 #else
 930 #warning What do we have to do here??
 931 #endif
 932         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 933                              vma->vm_end - vma->vm_start, vma->vm_page_prot))
 934                 return -EAGAIN;
 935 #endif /* !__sparc_v9__ */
 936         return 0;
 937 #endif /* !sparc32 */
 938 }
 939
 940 static int
 941 fb_open(struct inode *inode, struct file *file)
 942 {
 943         int fbidx = iminor(inode);
 944         struct fb_info *info;
 945         int res = 0;
 946
 947         if (fbidx >= FB_MAX)
 948                 return -ENODEV;
 949 #ifdef CONFIG_KMOD
 950         if (!(info = registered_fb[fbidx]))
 951                 try_to_load(fbidx);
 952 #endif /* CONFIG_KMOD */
 953         if (!(info = registered_fb[fbidx]))
 954                 return -ENODEV;
 955         if (!try_module_get(info->fbops->owner))
 956                 return -ENODEV;
 957         if (info->fbops->fb_open) {
 958                 res = info->fbops->fb_open(info,1);
 959                 if (res)
 960                         module_put(info->fbops->owner);
 961         }
 962         return res;
 963 }
 964
 965 static int
 966 fb_release(struct inode *inode, struct file *file)
 967 {
 968         int fbidx = iminor(inode);
 969         struct fb_info *info;
 970
 971         lock_kernel();
 972         info = registered_fb[fbidx];
 973         if (info->fbops->fb_release)
 974                 info->fbops->fb_release(info,1);
 975         module_put(info->fbops->owner);
 976         unlock_kernel();
 977         return 0;
 978 }
 979
 980 static struct file_operations fb_fops = {
 981         .owner =        THIS_MODULE,
 982         .read =         fb_read,
 983         .write =        fb_write,
 984         .ioctl =        fb_ioctl,
 985 #ifdef CONFIG_COMPAT
 986         .compat_ioctl = fb_compat_ioctl,
 987 #endif
 988         .mmap =         fb_mmap,
 989         .open =         fb_open,
 990         .release =      fb_release,
 991 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
 992         .get_unmapped_area = get_fb_unmapped_area,
 993 #endif
 994 };
 995
 996 static struct class *fb_class;
 997
 998 /**
 999  *      register_framebuffer - registers a frame buffer device
1000  *      @fb_info: frame buffer info structure
1001  *
1002  *      Registers a frame buffer device @fb_info.
1003  *
1004  *      Returns negative errno on error, or zero for success.
1005  *
1006  */
1007
1008 int
1009 register_framebuffer(struct fb_info *fb_info)
1010 {
1011         int i;
1012         struct fb_event event;
1013
1014         if (num_registered_fb == FB_MAX)
1015                 return -ENXIO;
1016         num_registered_fb++;
1017         for (i = 0 ; i < FB_MAX; i++)
1018                 if (!registered_fb[i])
1019                         break;
1020         fb_info->node = i;
1021
1022         fb_info->class_device = class_device_create(fb_class, MKDEV(FB_MAJOR, i),
1023                                     fb_info->device, "fb%d", i);
1024         if (IS_ERR(fb_info->class_device)) {
1025                 /* Not fatal */
1026                 printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->class_device));
1027                 fb_info->class_device = NULL;
1028         } else
1029                 fb_init_class_device(fb_info);
1030
1031         if (fb_info->pixmap.addr == NULL) {
1032                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1033                 if (fb_info->pixmap.addr) {
1034                         fb_info->pixmap.size = FBPIXMAPSIZE;
1035                         fb_info->pixmap.buf_align = 1;
1036                         fb_info->pixmap.scan_align = 1;
1037                         fb_info->pixmap.access_align = 32;
1038                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1039                 }
1040         }
1041         fb_info->pixmap.offset = 0;
1042
1043         if (!fb_info->modelist.prev ||
1044             !fb_info->modelist.next ||
1045             list_empty(&fb_info->modelist)) {
1046                 struct fb_videomode mode;
1047
1048                 INIT_LIST_HEAD(&fb_info->modelist);
1049                 fb_var_to_videomode(&mode, &fb_info->var);
1050                 fb_add_videomode(&mode, &fb_info->modelist);
1051         }
1052
1053         registered_fb[i] = fb_info;
1054
1055         devfs_mk_cdev(MKDEV(FB_MAJOR, i),
1056                         S_IFCHR | S_IRUGO | S_IWUGO, "fb/%d", i);
1057         event.info = fb_info;
1058         notifier_call_chain(&fb_notifier_list,
1059                             FB_EVENT_FB_REGISTERED, &event);
1060         return 0;
1061 }
1062
1063
1064 /**
1065  *      unregister_framebuffer - releases a frame buffer device
1066  *      @fb_info: frame buffer info structure
1067  *
1068  *      Unregisters a frame buffer device @fb_info.
1069  *
1070  *      Returns negative errno on error, or zero for success.
1071  *
1072  */
1073
1074 int
1075 unregister_framebuffer(struct fb_info *fb_info)
1076 {
1077         int i;
1078
1079         i = fb_info->node;
1080         if (!registered_fb[i])
1081                 return -EINVAL;
1082         devfs_remove("fb/%d", i);
1083
1084         if (fb_info->pixmap.addr && (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1085                 kfree(fb_info->pixmap.addr);
1086         fb_destroy_modelist(&fb_info->modelist);
1087         registered_fb[i]=NULL;
1088         num_registered_fb--;
1089         fb_cleanup_class_device(fb_info);
1090         class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1091         return 0;
1092 }
1093
1094 /**
1095  *      fb_register_client - register a client notifier
1096  *      @nb: notifier block to callback on events
1097  */
1098 int fb_register_client(struct notifier_block *nb)
1099 {
1100         return notifier_chain_register(&fb_notifier_list, nb);
1101 }
1102
1103 /**
1104  *      fb_unregister_client - unregister a client notifier
1105  *      @nb: notifier block to callback on events
1106  */
1107 int fb_unregister_client(struct notifier_block *nb)
1108 {
1109         return notifier_chain_unregister(&fb_notifier_list, nb);
1110 }
1111
1112 /**
1113  *      fb_set_suspend - low level driver signals suspend
1114  *      @info: framebuffer affected
1115  *      @state: 0 = resuming, !=0 = suspending
1116  *
1117  *      This is meant to be used by low level drivers to
1118  *      signal suspend/resume to the core & clients.
1119  *      It must be called with the console semaphore held
1120  */
1121 void fb_set_suspend(struct fb_info *info, int state)
1122 {
1123         struct fb_event event;
1124
1125         event.info = info;
1126         if (state) {
1127                 notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
1128                 info->state = FBINFO_STATE_SUSPENDED;
1129         } else {
1130                 info->state = FBINFO_STATE_RUNNING;
1131                 notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
1132         }
1133 }
1134
1135 /**
1136  *      fbmem_init - init frame buffer subsystem
1137  *
1138  *      Initialize the frame buffer subsystem.
1139  *
1140  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1141  *
1142  */
1143
1144 static int __init
1145 fbmem_init(void)
1146 {
1147         create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);
1148
1149         devfs_mk_dir("fb");
1150         if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1151                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1152
1153         fb_class = class_create(THIS_MODULE, "graphics");
1154         if (IS_ERR(fb_class)) {
1155                 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1156                 fb_class = NULL;
1157         }
1158         return 0;
1159 }
1160
1161 #ifdef MODULE
1162 module_init(fbmem_init);
1163 static void __exit
1164 fbmem_exit(void)
1165 {
1166         class_destroy(fb_class);
1167         unregister_chrdev(FB_MAJOR, "fb");
1168 }
1169
1170 module_exit(fbmem_exit);
1171 MODULE_LICENSE("GPL");
1172 MODULE_DESCRIPTION("Framebuffer base");
1173 #else
1174 subsys_initcall(fbmem_init);
1175 #endif
1176
1177 int fb_new_modelist(struct fb_info *info)
1178 {
1179         struct fb_event event;
1180         struct fb_var_screeninfo var = info->var;
1181         struct list_head *pos, *n;
1182         struct fb_modelist *modelist;
1183         struct fb_videomode *m, mode;
1184         int err = 1;
1185
1186         list_for_each_safe(pos, n, &info->modelist) {
1187                 modelist = list_entry(pos, struct fb_modelist, list);
1188                 m = &modelist->mode;
1189                 fb_videomode_to_var(&var, m);
1190                 var.activate = FB_ACTIVATE_TEST;
1191                 err = fb_set_var(info, &var);
1192                 fb_var_to_videomode(&mode, &var);
1193                 if (err || !fb_mode_is_equal(m, &mode)) {
1194                         list_del(pos);
1195                         kfree(pos);
1196                 }
1197         }
1198
1199         err = 1;
1200
1201         if (!list_empty(&info->modelist)) {
1202                 event.info = info;
1203                 err = notifier_call_chain(&fb_notifier_list,
1204                                            FB_EVENT_NEW_MODELIST,
1205                                            &event);
1206         }
1207
1208         return err;
1209 }
1210
1211 static char *video_options[FB_MAX];
1212 static int ofonly;
1213
1214 extern const char *global_mode_option;
1215
1216 /**
1217  * fb_get_options - get kernel boot parameters
1218  * @name:   framebuffer name as it would appear in
1219  *          the boot parameter line
1220  *          (video=<name>:<options>)
1221  * @option: the option will be stored here
1222  *
1223  * NOTE: Needed to maintain backwards compatibility
1224  */
1225 int fb_get_options(char *name, char **option)
1226 {
1227         char *opt, *options = NULL;
1228         int opt_len, retval = 0;
1229         int name_len = strlen(name), i;
1230
1231         if (name_len && ofonly && strncmp(name, "offb", 4))
1232                 retval = 1;
1233
1234         if (name_len && !retval) {
1235                 for (i = 0; i < FB_MAX; i++) {
1236                         if (video_options[i] == NULL)
1237                                 continue;
1238                         opt_len = strlen(video_options[i]);
1239                         if (!opt_len)
1240                                 continue;
1241                         opt = video_options[i];
1242                         if (!strncmp(name, opt, name_len) &&
1243                             opt[name_len] == ':')
1244                                 options = opt + name_len + 1;
1245                 }
1246         }
1247         if (options && !strncmp(options, "off", 3))
1248                 retval = 1;
1249
1250         if (option)
1251                 *option = options;
1252
1253         return retval;
1254 }
1255
1256 /**
1257  *      video_setup - process command line options
1258  *      @options: string of options
1259  *
1260  *      Process command line options for frame buffer subsystem.
1261  *
1262  *      NOTE: This function is a __setup and __init function.
1263  *            It only stores the options.  Drivers have to call
1264  *            fb_get_options() as necessary.
1265  *
1266  *      Returns zero.
1267  *
1268  */
1269 static int __init video_setup(char *options)
1270 {
1271         int i, global = 0;
1272
1273         if (!options || !*options)
1274                 global = 1;
1275
1276         if (!global && !strncmp(options, "ofonly", 6)) {
1277                 ofonly = 1;
1278                 global = 1;
1279         }
1280
1281         if (!global && !strstr(options, "fb:")) {
1282                 global_mode_option = options;
1283                 global = 1;
1284         }
1285
1286         if (!global) {
1287                 for (i = 0; i < FB_MAX; i++) {
1288                         if (video_options[i] == NULL) {
1289                                 video_options[i] = options;
1290                                 break;
1291                         }
1292
1293                 }
1294         }
1295
1296         return 0;
1297 }
1298 __setup("video=", video_setup);
1299
1300     /*
1301      *  Visible symbols for modules
1302      */
1303
1304 EXPORT_SYMBOL(register_framebuffer);
1305 EXPORT_SYMBOL(unregister_framebuffer);
1306 EXPORT_SYMBOL(num_registered_fb);
1307 EXPORT_SYMBOL(registered_fb);
1308 EXPORT_SYMBOL(fb_prepare_logo);
1309 EXPORT_SYMBOL(fb_show_logo);
1310 EXPORT_SYMBOL(fb_set_var);
1311 EXPORT_SYMBOL(fb_blank);
1312 EXPORT_SYMBOL(fb_pan_display);
1313 EXPORT_SYMBOL(fb_get_buffer_offset);
1314 EXPORT_SYMBOL(fb_set_suspend);
1315 EXPORT_SYMBOL(fb_register_client);
1316 EXPORT_SYMBOL(fb_unregister_client);
1317 EXPORT_SYMBOL(fb_get_options);
1318 EXPORT_SYMBOL(fb_new_modelist);
1319
1320 MODULE_LICENSE("GPL");